China Flat Welded Flange with Neck Supplier, Companies
Product Description
Key Features
- Unlike a standard Slip-On Flange (flat-faced), this flange has a short integrated hub (neck) that provides better reinforcement and stress distribution.
- The hub allows for a smoother transition between the pipe and flange, reducing turbulence and wear.
- The flange is slipped over the pipe and then welded both inside and outside (fillet weld on the hub side and butt weld on the pipe side).
- This double welding ensures a strong, leak-proof connection.
- Common materials: Carbon Steel (ASTM A105), Stainless Steel (A182 F304/F316), Alloy Steel.
- Standard dimensions: ASME B16.5, EN 1092-1, DIN, JIS, etc.
- Easier Alignment: The hub helps guide the pipe into place, simplifying installation.
- Cost-Effective: Cheaper than Weld Neck Flanges but stronger than standard Slip-On Flanges.
- Good for Low-Pressure Systems: Suitable for moderate pressure and temperature applications.
- Smooth Bore: Reduces turbulence and erosion in fluid flow.
- Not for High-Pressure/Temperature: Less robust than Weld Neck Flanges in extreme conditions.
- Double Welding Required: More welding work compared to Lap Joint or Threaded Flanges.
Common Applications
Comparison with Other Flange Types
| Feature | Flat Welded Flange with Neck | Standard Slip-On Flange | Weld Neck Flange |
|---|---|---|---|
| Strength | Medium | Low | High |
| Cost | Moderate | Low | High |
| Welding | Inside + Outside | Inside + Outside | Butt Weld Only |
| Best For | Moderate pressure systems | Low-pressure systems | High-pressure systems |
Conclusion
Frequently Asked Questions (FAQ)
A Flat Welded Flange with Neck (also known as a Hubbed Slip-On Flange) is a piping flange featuring a short integrated neck. It offers a balance between easy pipe alignment and enhanced mechanical strength compared to flat slip-on flanges.
The pipe is slipped inside the flange bore, and the flange is then secured with double welds—one fillet weld on the outer hub side and another weld on the interior side near the pipe end.
The integrated hub provides better reinforcement, superior stress distribution, and smoother fluid transition, reducing internal erosion while maintaining easy alignment during fitting.
They are commonly manufactured according to international standards such as ASME B16.5, EN 1092-1, DIN, and JIS standards using carbon steel, stainless steel, or alloy steel materials.
No, it is recommended for low to moderate-pressure applications. High-pressure or extreme-temperature pipelines typically require standard Weld Neck Flanges for higher structural integrity.
